fix: pass auth to custom registry

[cpreston321]

Resolves: #78

This change will inherit auth to custom GET registry -- just in case it is a private repo that I want to access. I want to use this soon as possible!

If you have any questions please let me know thanks! I will try to make changes if you have any better suggestions 💚

[codecov]

Codecov Report

Merging #77 (7fbad97) into main (d1d539c) will decrease coverage by 0.32%.
The diff coverage is 64.28%.

❗ Current head 7fbad97 differs from pull request most recent head 1413835. Consider uploading reports for the commit 1413835 to get more accurate results

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   70.00%   69.68%   -0.32%     
==========================================
  Files           6        6              
  Lines         310      320      +10     
  Branches       41       44       +3     
==========================================
+ Hits          217      223       +6     
- Misses         93       97       +4     

Impacted Files	Coverage Δ
src/registry.ts	35.71% <28.57%> (-3.42%)	⬇️
src/giget.ts	81.66% <100.00%> (+0.79%)	⬆️

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[pi0]

Thanks!